Improvement in gas-purifier trays or gratings



lined by very slight fastenings.

UNITED STATES JOHN L. CHEESMAN, OF NEW YORK, N. Y.

IMPROVEMENT IN GAS-PURIFIER TRYS OR GRATIfNGS.

Specification forming part of Letters Patent No. 139,702, dated June 10, 1873; application filed May 23, 1873.

To all whom it may concern.'

Be it known that I, JOHN L. CHEEsMAN, of New York city, in the State of New York, have invented certain new and useful Improvements in the Construction of Trays for Gas- Purifiers, of which the following is a specification:

The trays, sometimes called sieves, in common use, are gratings formed by cutting parallel slots in short lengths of pine boards ektendingl longitudinally nearly from one end to the other. It is important, for several reasons, that the boards be wide so as to give a large number ot' slats in a single piece.. To strengthen the tray against warping and splitting cross-pieces are nailed across on the under side, at each end.

The action of the lime and gases with the heat and wet severely tries the material, and is particularly destructive on the nails employed to fasten the cross-cleats. I have devised a construction which overcomes the difticulties and allows the cross-pieces to be con- The fastenings may be pegs of Wood or slight zinc nails, which are unalected by the chemicals.

Instead of attaching cleats on either face, I insert transverse pieces .of hard Wood through the body of the tray. I insert one such transverse strengthening at each end, and one or more across the tray, near the middle. placement by one or more slight pegs. I hold the central cross-piece or cross-pieces, and also hold the several slats in their proper relative positions, by putting a peg or nail into the crosspiece through each slat.

The accompanying drawings `form a part of this specification.

Figure l is a plan view; and Figs. 2 and 3 are transverse sections, showing two forms. Fig. 2 corresponds to Fig. l. Fig. 3 isa little different.

B B B are cross-pieces of oak or other hard I hold the end pieces against dis-y wood, tted tightly in holes produced through the board in the positions represented. The

central piece extends crosswise through all the spaces a. Pegs or nails C, driven through the pine into the oak, hold'the oak pieces against displacement. The pegs driven into the central pieceAnot only hold the same against displacement, but also hold each of the slats or gratings at exactly the proper distance from its neighbors.

Figure 2 shows the transverse bars B as round. Fig. 3 shows them as of rectangular section.

The improved trays may be handled with all the roughness ofthe ordinary ones, and no amount of exposure to destructive influences will aftect the eiciency of the transverse stifiening-supports. Slender nails of,

zinc, which would be too weak to aiord any considerable support applied directly to strips y on the outside, when driven into these strips are sufficient to keep them and the several slats in place. Zinc is unaiected by' the chemical agencies so also would be pins of hard wood.

I esteem it particularly important that the use of iron, as fastenings, shall be dispensed with, because of the liability of iron to rapid destruction by corrosion. Iron might, when applied as a mere fastening to prevent the end movements of lmy transverse pieces, B,

serve a useful purpose for a long period, butwmv" I greatly prefer small nails of zinc.

As constructed the tray forms au efficient and highly durable article, and presents nothing subject to corrosion.

I claim as my invention- The improved tray described, composed of the grated board A a, with the transverse pieces B inserted through holes in the body of the same, and with the incorrodible pegs or nails C, arranged as herein set forth.

In testimony whereof I have hereunto set my hand this 20th day of May, 1873, in the presence of two subscribing witnesses.

JOHN L. CHEESMAN. Witnesses: c WM. C. DEY,

GHAs. RoETTIG. 

